<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Hello World</title>
</head>
<body>
  <div id="app">
    <input type="text" v-model="name" placeholder="你的名字">
    <h1>你好，{{ name }}</h1>
  </div>
  <script src="https://unpkg.com/vue/dist/vue.min.js"></script>
  <script>
    var app = new Vue({
      el: '#app',
      data: {
        name: '呵呵'
      },
      created: function(){
        console.log(this.name);
      },
      mounted: function(){
        console.log(this.$el);
      }
    })
  </script>
</body>
</html>